Sprecher
Beschreibung
We discuss the effect of multiple mediators influencing the scattering of astrophysical neutrinos at the ultra-high energies — 100 TeV and beyond — against relic neutrinos from the Cosmic neutrino background, demonstrating unique features in the resulting spectral shape as detected at neutrino telescopes like IceCube. We specifically discuss the effect of superposition of scattering amplitudes involving interactions mediated by bosons of close but distinct masses and the importance of considering off-resonant T/U channel scattering in scenarios like these, in addition to the resonant S channels. As an example, we consider the case of L_μ – L_τ symmetry in a KK extra-dimensional scenario, leading to the existence of a tower of multiple vector bosons capable of mediating such neutrino self interactions. We show that in this specific case, the features in the flux spectrum, especially at the higher energies of the astrophysical neutrino spectrum, would be clearly distinctive from that expected in standard model scenarios.